package com.jredu.util;

import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Iterator;
import java.util.Map;

import javax.activation.MimetypesFileTypeMap;

import com.jredu.constants.GlobalConstants;

public class HttpPostUploadUtil {
	
	public String urlStr;

	public HttpPostUploadUtil() {
		urlStr = "http://file.api.weixin.qq.com/cgi-bin/media/upload?access_token="+GlobalConstants.getString("access_token")+"&type=image";
	}
	
	/** 
     * 上传图片 
     *  
     * @param urlStr 
     * @param textMap 
     * @param fileMap 
     * @return 
	 * @throws IOException 
     */  
	public String formUpload(Map<String,String> textMap,Map<String,String> fileMap) throws IOException{
		
		String res = "";  
        HttpURLConnection conn = null;
        String BOUNDARY = "---------------------------123821742118716"; //boundary 就是 request 头和上传文件内容的分隔符 
        
        try {
			URL url = new URL(urlStr);
			conn = (HttpURLConnection) url.openConnection();
			conn.setConnectTimeout(5000);  
            conn.setReadTimeout(30000);  
            conn.setDoOutput(true);  
            conn.setDoInput(true);  
            conn.setUseCaches(false);  
            conn.setRequestMethod("POST");  
            conn.setRequestProperty("Connection", "Keep-Alive");
            conn.setRequestProperty("User-Agent",  
                    "Mozilla/5.0 (Windows; U; Windows NT 6.1; zh-CN; rv:1.9.2.6)");
            conn.setRequestProperty("Content-Type",  
                    "multipart/form-data; boundary=" + BOUNDARY);
            OutputStream out = new DataOutputStream(conn.getOutputStream());
            if(textMap != null){
            	StringBuffer sb = new StringBuffer();
            	/**
            	 * 常用方法
            	 */
            	for (String key : textMap.keySet()) {
            		System.out.println("key= "+ key + " and value= " + textMap.get(key));
            	}
            	
            	/**
            	 * Map.Entry的推荐用法
            	 * 适用于大容量
            	 */
            	for(Map.Entry<String, String> entry : textMap.entrySet()){
            		String inputName = (String) entry.getKey();  
                    String inputValue = (String) entry.getValue();
                    if (inputValue == null) {  
                        continue;  
                    }  
                    sb.append("\r\n").append("--").append(BOUNDARY).append(  
                            "\r\n");  
                    sb.append("Content-Disposition: form-data; name=\""  
                            + inputName + "\"\r\n\r\n");  
                    sb.append(inputValue);  
            	}
            	/**
            	 * 另一种用法
            	 */
//            	Iterator<?> iter = textMap.entrySet().iterator(); 
//            	while (iter.hasNext()) {  
//                    Map.Entry entry = (Map.Entry) iter.next();  
//                    String inputName = (String) entry.getKey();  
//                    String inputValue = (String) entry.getValue();  
//                    if (inputValue == null) {  
//                        continue;  
//                    }  
//                    sb.append("\r\n").append("--").append(BOUNDARY).append(  
//                            "\r\n");  
//                    sb.append("Content-Disposition: form-data; name=\""  
//                            + inputName + "\"\r\n\r\n");  
//                    sb.append(inputValue);  
//                }  
            	out.write(sb.toString().getBytes());
            }
            // file  
            if (fileMap != null) { 
            	Iterator<?> iter = textMap.entrySet().iterator(); 
            	while (iter.hasNext()) {  
                    Map.Entry entry = (Map.Entry) iter.next();  
                    String inputName = (String) entry.getKey();  
                    String inputValue = (String) entry.getValue();  
                    if (inputValue == null) {  
                        continue;  
                    } 
                    File file = new File(inputValue);  
                    String filename = file.getName();  
                    String contentType = new MimetypesFileTypeMap()  
                            .getContentType(file);  
                    if (filename.endsWith(".jpg")) {  
                        contentType = "image/jpg";  
                    }  
                    if (contentType == null || contentType.equals("")) {  
                        contentType = "application/octet-stream";  
                    }  

                    StringBuffer strBuf = new StringBuffer();  
                    strBuf.append("\r\n").append("--").append(BOUNDARY).append(  
                            "\r\n");  
                    strBuf.append("Content-Disposition: form-data; name=\""  
                            + inputName + "\"; filename=\"" + filename  
                            + "\"\r\n");  
                    strBuf.append("Content-Type:" + contentType + "\r\n\r\n");  

                    out.write(strBuf.toString().getBytes());  

                    DataInputStream in = new DataInputStream(  
                            new FileInputStream(file));  
                    int bytes = 0;  
                    byte[] bufferOut = new byte[1024];  
                    while ((bytes = in.read(bufferOut)) != -1) {  
                        out.write(bufferOut, 0, bytes);  
                    }  
                    in.close();  
                }  
            }
            byte[] endData = ("\r\n--" + BOUNDARY + "--\r\n").getBytes();  
            out.write(endData);  
            out.flush();  
            out.close();  

            // 读取返回数据  
            StringBuffer strBuf = new StringBuffer();  
            BufferedReader reader = new BufferedReader(new InputStreamReader(  
                    conn.getInputStream()));  
            String line = null;  
            while ((line = reader.readLine()) != null) {  
                strBuf.append(line).append("\n");  
            }  
            res = strBuf.toString();  
            reader.close();  
            reader = null;  
        } catch (Exception e) {  
            System.out.println("发送 POST 请求出错。" + urlStr);  
            e.printStackTrace();  
        } finally {  
            if (conn != null) {  
                conn.disconnect();  
                conn = null;  
            }  
        }    
		return urlStr;	
	}
	
	

}
